Granted Patent
Utility
US 6,606,279 · App. 09/257,492
Submergence detection for electro acoustic transducers
Inventor:
Ashley Preston
Patented Case
View Patent ↗
Granted: Aug 12, 2003
Filed: Feb 25, 1999
Inventor
Ashley Preston
Assignee (at issue)
Milltronics Ltd.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.